Continuous image capturing based on detection of a specific state

ABSTRACT

An apparatus includes: an element that receives subject light from a subject to generate image data; a section that generates a recording image to be recorded on a recording medium from the image data when a first mode is set; a section that generates a second display image, which allows display of a live-view image, from the image data when a second mode is set, and that generates a first display image, which allows display of an image identical to the recording image, from the image data when the first mode is set; a section that sequentially displays the first display image or the second display image; a section that detects a specific state of the apparatus that obstructs recording of an imaging object onto the recording image; and a section that controls switching between the first mode and the second mode on the basis of the detection results.

This application is a continuation of U.S. patent application Ser. No.14/161,954 filed on Jan. 23, 2014, which is a continuation of U.S.patent application Ser. No. 13/170,832 filed on Jun. 28, 2011, whichclaims priority from Japanese Patent Application 2010-185706 filed inthe Japan Patent Office on Aug. 23, 2010. Each of the above referencedapplications is hereby incorporated herein by reference in its entirety.

BACKGROUND

The present disclosure relates to an imaging apparatus, and inparticular to an imaging apparatus that continuously captures aplurality of recording images, a method of controlling the imagingapparatus, and a program that causes a computer to execute the method.

In recent years, imaging apparatuses such as digital still cameras thatcapture an image of a subject such as a person to generate a capturedimage and record the generated captured image have been commonly used.Among the imaging apparatuses, imaging apparatuses equipped with acontinuous image capture (shooting) function are widely used.

For example, an imaging apparatus that performs quick image processingon continuously captured images to provide a high-speed continuousshooting function is proposed (see Japanese Unexamined PatentApplication Publication No. 2008-219319 (FIG. 4), for example). In theimaging apparatus, image data (RAW data) generated by an imaging elementare subjected to a correction process performed by a front engine, andthe correction-processed image data are supplied to a plurality of backengines, one by one. After being subjected to image processing performedby the back engines, the image data are recorded onto a recording mediumin the chronological order of capture. In the imaging apparatus, theplurality of back engines perform image processing to achieve high-speedimage processing, which improves the continuous shooting speed. Sincethe plurality of back engines perform image processing, in addition, thespeed of generation of an after-view image (a display image that allowsa user to examine an image captured for recording) from theimage-processed data (image data for recording) is also improved.

SUMMARY

According to the technology of the related art discussed above, it ispossible to display an after-view image, which is generated on the basisof the quickly image-processed image data for recording, duringcontinuous shooting.

According to the technology of the related art described above, however,a suspension of continuous shooting due to a factor other than a delayin image processing may cause a suspension of generation of anafter-view image along with the suspension of the continuous shooting,and hence a suspension of updating of display on a display screen(frozen display). Thus, in the case where the display on the displayscreen is frozen until the continuous shooting action is resumed, adeviation in composition may be caused between the image being displayed(after-view image) and the subject included in the image capture range.Therefore, as the time of the suspension of the continuous shootingaction becomes longer, the deviation in composition between theafter-view image and the subject included in the image capture rangebecomes larger, which may make it difficult for the user to acquire anintended captured image. Thus, it is important to appropriately providethe user with a display image for subject examination when continuouslycapturing a plurality of recording images.

It is therefore desirable to appropriately provide a user with a displayimage for subject examination when continuously capturing a plurality ofrecording images.

According to a first embodiment of the present disclosure, there isprovided an imaging apparatus including: an imaging element thatreceives subject light from a subject to generate image data; arecording image generation section that generates a recording image,which is an image to be recorded on a recording medium, on the basis ofthe image data generated by the imaging element in the case where afirst mode is set; a display image generation section that generates asecond display image, which allows display of a live-view image, on thebasis of the image data generated by the imaging element in the casewhere a second mode is set, and that generates a first display image,which allows display of an image that is identical to the recordingimage, on the basis of the image data generated by the imaging elementin the case where the first mode is set; a display section thatsequentially displays the first display image or the second displayimage generated by the display image generation section; a detectionsection that detects a specific state which is a state of the imagingapparatus that obstructs recording of an imaging object onto therecording image; and a mode control section that performs mode switchingcontrol, in which switching is performed between the first mode and thesecond mode, on the basis of results of detection performed by thedetection section. According to the first embodiment of the presentdisclosure, there are also provided a method of controlling the imagingapparatus, and a program that causes a computer to execute the method.This makes it possible to perform the mode switching control on thebasis of the detection results of a specific state which is a state ofthe imaging apparatus that obstructs recording of an imaging object ontothe recording image.

In the first embodiment, the imaging apparatus may further include anoperation receiving section that receives a continuous image captureaction command operation, and the mode control section may perform themode switching control in the case where the continuous image captureaction command operation is received. This makes it possible to performthe mode switching control in the case where a continuous image captureaction is performed.

In the first embodiment, the imaging apparatus may further include anoperation receiving section that receives an image capture actioncommand operation, and the mode control section may perform the modeswitching control in the case where a continuity of the continuous imagecapture action command operations is received. This makes it possible toperform the mode switching control in the case where a continuity ofcontinuous image capture actions is performed.

In the first embodiment, the display image generation section mayperform a thinning-out process or an adding process on the image datagenerated by the imaging element to generate the first display image onthe basis of image data generated through the thinning-out or addingprocess in the case where the first mode is set. This makes it possibleto perform a thinning-out process on the image data generated by theimaging element to generate the first display image on the basis ofimage data generated through the thinning-out process in the case wherethe first mode is set.

In the first embodiment, the imaging element may generate the image datathrough all-pixel reading in the case where the first mode is set, andgenerate the image data through thinned-out reading or added reading inthe case where the second mode is set. This makes it possible togenerate the image data through all-pixel reading in the case where thefirst mode is set, and to generate the image data through thinned-outreading in the case where the second mode is set.

In the first embodiment, the mode control section may perform controlfor switching from the first mode to the second mode at a timing whenreading of the image data from the imaging element is terminated in thecase where the first mode is set. This makes it possible to performcontrol for switching from the first mode to the second mode at a timingwhen reading of the image data from the imaging element is terminated inthe case where the first mode is set. In this case, in addition, in thecase where the control for switching from the first mode to the secondmode is performed at the timing, the mode control section may disablecontrol for switching from the second mode to the first mode until apredetermined time elapses from the timing. This makes it possible toenable control for switching from the second mode to the first modeafter a predetermined time elapses from the timing when control forswitching from the first mode to the second mode is performed.

In the first embodiment, the display section may display the seconddisplay image in the case where the second mode is set, and display thefirst display image in the case where the first mode is set. This makesit possible to display the second display image in the case where thesecond mode is set, and to display the first display image in the casewhere the first mode is set.

In the first embodiment, the display section may be an electronic viewfinder. This makes it possible to display the second display image orthe first display image on the electronic view finder.

In the first embodiment, the imaging apparatus may further include adata duplication section that duplicates the image data generated by theimaging element to supply the duplicated image data to the recordingimage generation section and the display image generation section in thecase where the first mode is set, and a buffer provided between the dataduplication section and the recording image generation section to retaina plurality of pieces of the image data being supplied from the dataduplication section to the recording image generation section in achronological order and to supply the retained data to the recordingimage generation section in accordance with a status of generation ofthe recording image performed by the recording image generation section,and the detection section may detect the specific state on the basis ofa free space of the buffer. This makes it possible to detect thespecific state on the basis of a free space of the buffer.

In the first embodiment, the imaging apparatus may further include anin-focus determination section that performs in-focus determination onthe basis of the subject light, and the detection section may detect thespecific state on the basis of results of the in-focus determination.This makes it possible to detect the specific state on the basis ofresults of the in-focus determination.

In the first embodiment, the imaging apparatus may further include alight emitting section that momentarily emits light to the subject inthe case where the first mode is set, and the detection section maydetect the specific state on the basis of a state of charge of the lightemitting section. This makes it possible to detect the specific state onthe basis of a state of charge of the light emitting section.

In the first embodiment, the imaging apparatus may further include apower source management section that compares an amount of current thatmay be supplied to various sections of the imaging apparatus and anamount of current that is necessary for the various sections to managean amount of current to be supplied to the various sections, and thedetection section may detect the specific state on the basis of resultsof management performed by the power source management section. Thismakes it possible to detect the specific state on the basis of resultsof management performed by the power source management section.

In the first embodiment, the detection section may detect the specificstate on the basis of occurrence of a change to a setting of the imagingapparatus. This makes it possible to detect the specific state on thebasis of occurrence of a change to a setting of the imaging apparatus.

According to the present disclosure, it is advantageously possible toappropriately provide a user with a display image for subjectexamination when continuously capturing a plurality of recording images.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing an exemplary functional configurationof an imaging apparatus according to an embodiment of the presentdisclosure;

FIG. 2 is a cross-sectional view schematically showing an exemplarycross-sectional configuration of the imaging apparatus according to theembodiment of the present disclosure;

FIG. 3 is a schematic diagram showing exemplary generation of recordingimage data and display image data based on RAW data (all pixels)generated by an image sensor set to a recording image generation modeaccording to the embodiment of the present disclosure;

FIG. 4 is a timing chart showing exemplary mode switching between therecording image generation mode and a live-view image generation modeperformed in the imaging apparatus according to the embodiment of thepresent disclosure during a continuous shooting action; and

FIG. 5 is a flowchart showing exemplary continuous image capture controlprocedures performed in the imaging apparatus according to theembodiment of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

An embodiment of the present disclosure will be described below:

[Exemplary Functional Configuration of Imaging Apparatus]

FIG. 1 is a block diagram showing an exemplary functional configurationof an imaging apparatus 100 according to an embodiment of the presentdisclosure. The imaging apparatus 100 is an imaging apparatus thatcaptures an image of a subject to generate image data and record thegenerated image data as an image content (recording image).

The imaging apparatus 100 includes a lens section 110, an operationreceiving section 120, a control section 130, an image sensor 140, abuffer 151, a recording image generation section 152, a recordingsection 153, a display section 160, and a drive section 170. The imagingapparatus 100 also includes a data duplication section 210, a displayimage generation section 220, an obstruction detection section 230, apower source management section 240, a strobe operation managementsection 250, an in-focus determination section 260, a buffer managementsection 270, and an operation mode determination section 280.

The lens section 110 condenses light from a subject (subject light). Thelens section 110 includes a zoom lens 111, a diaphragm 112, and a focuslens 113.

The zoom lens 111 is driven by the drive section 170 to move in theoptical axis direction to vary the focal length in order to adjust themagnification of the subject included in a captured image.

The diaphragm 112 is a shielding object driven by the drive section 170to vary the degree of opening in order to adjust the amount of thesubject light to be incident into the image sensor 140.

The focus lens 113 is driven by the drive section 170 to move in theoptical axis direction in order to adjust a focus state.

The operation receiving section 120 receives an operation from a user.For example, in the case where a shutter button 121 (shown in FIG. 2) isdepressed, the operation receiving section 120 supplies the controlsection 130 with a signal related to the depression (image capturecommand operation) as an operation signal.

The control section 130 controls various operations performed in theimaging apparatus 100. For example, in the case where the image capturemode of the imaging apparatus 100 is set to a continuous shooting mode,in the case where the shutter button 121 is depressed, the controlsection 130 determines that an operation for commanding continuous imagecapture (continuous image capture command operation) has been received,and commands execution of recording (continuous shooting) of a pluralityof chronologically continuous still images. The control section 130supplies the operation mode determination section 280 and the imagesensor 140 with a signal for commanding execution of continuous shooting(continuous shooting action signal).

The image sensor 140 is an imaging element that performs photoelectricconversion on the received subject light into an electrical signal. Theimage sensor 140 may be implemented by a CMOS (Complementary Metal OxideSemiconductor) sensor, a CCD (Charge Coupled Device) sensor, or thelike, for example. The image sensor 140 generates RAW data, which areunprocessed (undeveloped) image data which have not been subjected to acorrection process etc., on the basis of the electrical signal producedthrough the photoelectric conversion.

In the case where the operation mode of the imaging apparatus 100 is thecontinuous shooting mode, the image sensor 140 switches between arecording image generation mode for generating a still image and alive-view image generation mode for generating a live-view image. Theterm “live-view image” as used herein refers to a real-time display ofan image of the subject to be incident into the imaging apparatus 100.In the case where the image sensor 140 is set to the recording imagegeneration mode, electrical signals are read from all the pixelsdisposed in the image sensor 140 to generate RAW data (RAW data (allpixels)). In the case where the image sensor 140 is set to the live-viewimage generation mode, electrical signals are read from the pixelsdisposed in the image sensor 140 in such a manner that results in areduced amount of read data to generate RAW data. In the embodiment ofthe present disclosure, the image sensor 140 set to the live-view imagegeneration mode performs thinned-out reading when reading electricalsignals from the pixels disposed in the image sensor 140 to generate RAWdata (RAW data (thinned out)). Another method that results in a reducedamount of read data is to add electrical signals read from adjacentpixels when reading data to generate RAW data (added reading) on thebasis of the added read data.

Since the RAW data (all pixels) are generated through all-pixel readingand the RAW data (thinned out) are generated through thinned-outreading, the frame rate (interval between generations of RAW data) ishigher in the live-view image generation mode for generating RAW data(thinned out). The image sensor 140 supplies the generated RAW data tothe data duplication section 210.

The image sensor 140 supplies the in-focus determination section 260with signals generated by pixels disposed at a position corresponding toan area in which focusing is performed (focus area). The recording imagegeneration mode is an example of a first mode according to an embodimentof the present disclosure. The live-view image generation mode is anexample of a second mode according to an embodiment of the presentdisclosure.

The data duplication section 210 duplicates the RAW data (RAW data (allpixels)) generated by the image sensor 140 set to the recording imagegeneration mode to supply the duplicated RAW data to the buffer 151 andthe display image generation section 220. Also, the data duplicationsection 210 supplies the RAW data (RAW data (thinned out)) generated bythe image sensor 140 set to the live-view image generation mode only tothe display image generation section 220.

The buffer 151 temporarily retains the RAW data (RAW data (all pixels))supplied from the data duplication section 210. The RAW data (allpixels) retained in the buffer 151 are used by the recording imagegeneration section 152 to generate image data (recording image data).The buffer 151 has a capacity enough to retain a plurality of pieces ofRAW data (RAW data (all pixels)) generated through all-pixel reading,and sequentially retains the RAW data supplied from the data duplicationsection 210 in the chronological order. The buffer 151 is an area of aRAM (Random Access Memory) provided in the imaging apparatus 100 that isassigned to the RAW data (all pixels) to be processed in the recordingimage generation section 152, for example. In the case where therecording image data are recorded by the recording section 153 so thatthe process to be performed by the recording image generation section152 has been terminated, the buffer 151 supplies the recording imagegeneration section 152 with one piece of the retained RAW data that isthe oldest in the chronological order to cause the recording imagegeneration section 152 to start a next process. Also, the buffer 151supplies the buffer management section 270 with information indicatingthe status of use of the buffer 151.

The recording image generation section 152 generates recording imagedata, which are to be recorded by the recording section 153, on thebasis of the RAW data (all pixels) supplied from the buffer 151. Therecording image generation section 152 performs a correction process, adevelopment process, an image data compression process, etc., on thebasis of the RAW data (all pixels), for example. The recording imagegeneration section 152 supplies the generated recording image data tothe recording section 153 to cause the recording section 153 to storethe supplied recording image data.

The generation of the recording image data performed by the recordingimage generation section 152 will be described on the assumption that animage compressed in accordance with a JPEG (Joint Photographic ExpertsGroup) scheme is to be recorded by the recording section 153 as therecording image data. First, the recording image generation section 152performs a correction process, a development process, etc., on the basisof the RAW data to generate an image. Subsequently, the recording imagegeneration section 152 performs an image data compression process on thebasis of the JPEG scheme, and records the generated compressed recordingimage data (JPEG data) on the recording section 153.

In the case where the RAW data as they are to be recorded by therecording section 153 as the recording image data, the recording imagegeneration section 152 does not perform a development process etc. tosupply the RAW data as they are to the recording section 153 as therecording image data to cause the recording section 153 to store thesupplied RAW data.

The recording section 153 records the recording image data supplied fromthe recording image generation section 152 as an image content (imagefile). As the recording section 153, a disk such as a DVD (DigitalVersatile Disk) and a removable recording medium (one or a plurality ofrecording media) such as a semiconductor memory such as a memory cardmay be used, for example. Such a recording medium may be built in theimaging apparatus 100 or removably mounted to the imaging apparatus 100.

The display image generation section 220 generates display image data,which are to be viewed by the user on the display section 160, on thebasis of the RAW data supplied from the data duplication section 210. Inthe case where the RAW data (all pixels) are supplied from the dataduplication section 210, first, the display image generation section 220performs a process for reducing the amount of the RAW data (all pixels).As such a process, the display image generation section 220 according tothe embodiment of the present disclosure may perform a process forthinning out pixel-by-pixel information contained in the RAW data (allpixels) at predetermined intervals to generate thinned-out data. Then,the display image generation section 220 performs a development processusing the thinned-out data, and supplies image data (display image data)generated through the development process to the display section 160 tocause the display section 160 to display the supplied display imagedata. Besides the thinning-out process, another method that results in areduced amount of data is to add data from adjacently disposed pixels toreduce the amount of data (adding process).

In the case where RAW data (thinned out) are supplied, the display imagegeneration section 220 performs a development process using the suppliedRAW data (thinned out), and supplies display image data generatedthrough the development process to the display section 160 to cause thedisplay section 160 to display the supplied display image data.

The display section 160 displays an image on the basis of the displayimage data supplied from the display image generation section 220. Thedisplay section 160 may be implemented by a color liquid crystal panel,for example.

The in-focus determination section 260 determines whether or not anobject to be focused on (focusing object) is in focus on the basis of asignal for use for in-focus determination supplied from the image sensor140. The in-focus determination section 260 may determine whether or notthe focusing object is in focus using a contrast scheme, for example.The in-focus determination section 260 supplies the drive section 170with a signal for driving the focus lens 113 to detect a focus state. Inthe case where the focusing object which was brought into focus hascontinued to be in focus, the in-focus determination section 260supplies the drive section 170 with information indicating the in-focusstate as in-focus determination result information. In the case wherethe focusing object which was brought into focus has shifted out offocus, the in-focus determination section 260 calculates (estimates) theamount of the shift (defocus amount), and supplies the drive section 170with information indicating the calculated defocus amount as thein-focus determination result information. In the case where thefocusing object has shifted out of focus so abruptly that the defocusamount may not be estimated (in a state in which the focusing object maynot brought into focus by auto focus, the in-focus determination section260 supplies the drive section 170 with information indicating that thedefocus amount may not be estimated as the in-focus determination resultinformation. The in-focus determination section 260 also supplies thein-focus determination result information to the obstruction detectionsection 230.

The drive section 170 drives the zoom lens 111, the diaphragm 112, andthe focus lens 113. For example, the drive section 170 calculates thedrive amount of the focus lens 113 on the basis of the in-focusdetermination result information output from the in-focus determinationsection 260, and moves the focus lens 113 in accordance with thecalculated drive amount. In the case where the focusing object is infocus, the drive section 170 maintains the current position of the focuslens 113. In the case where the focusing object is out of focus, thedrive section 170 calculates the drive amount (amount of movement) onthe basis of the in-focus determination result information indicatingthe defocus amount and information on the position of the focus lens113, and moves the focus lens 113 in accordance with the calculateddrive amount. In the case where the in-focus determination resultinformation indicating that the defocus amount may not be estimated, thedrive section 170 attempts to quickly establish a state in which thefocusing object is in focus by scanning the focus lens 113 over theentire range, for example.

The power source management section 240 manages a power source in theimaging apparatus 100. The power source management section 240 comparesthe amount of current that may be supplied by the power source and theamount of current that is necessary to drive the various sections of theimaging apparatus 100 to supply information indicating the comparisonresults (power source information) to the obstruction detection section230.

The strobe operation management section 250 manages an operation of astrobe (not shown). The strobe operation management section 250 suppliesthe obstruction detection section 230 with information indicating theremaining charge capacity of the strobe. The strobe is an example of alight emitting section according to an embodiment of the presentdisclosure.

The buffer management section 270 manages the buffer 151 in the imagingapparatus 100. The buffer management section 270 supplies theobstruction detection section 230 with information indicating the freespace of the buffer 151.

The obstruction detection section 230 detects whether or not anobstructive factor (specific state) that obstructs image capture(recording of an imaging object onto a recording image) is occurringwhile continuously capturing a plurality of recording images (during acontinuous shooting action). The obstruction detection section 230detects whether or not an obstructive factor is occurring on the basisof the status of operations of the various sections of the imagingapparatus 100, and supplies the operation mode determination section 280with the detection results as continuous shooting determinationinformation. In the case where an obstructive factor that obstructsimage capture is not occurring so that a continuous shooting action maybe continued, the obstruction detection section 230 supplies theoperation mode determination section 280 with the continuous shootingdetermination information indicating that continuous shooting is allowed(for example, of signals at two potentials (H and L), a signal at anL-level potential). In the case where an obstructive factor is occurringso that a continuous shooting action may not be performed, theobstruction detection section 230 supplies the operation modedetermination section 280 with the continuous shooting determinationinformation indicating that an obstructive factor is occurring (forexample, a signal at an H-level potential). The obstruction detectionsection 230 is an example of a detection section according to anembodiment of the present disclosure.

The detection of an obstructive factor performed on the basis of theinformation from the buffer management section 270, the in-focusdetermination section 260, the strobe operation management section 250,and the power source management section 240 will be described.

The obstruction detection section 230 calculates the number of pieces ofRAW data (all pixels) that may additionally be retained in the buffer151 on the basis of the information supplied from the buffer managementsection 270. Then, in the case where it is detected that there is a freespace for retaining RAW data (all pixels), the obstruction detectionsection 230 supplies the continuous shooting determination informationindicating that continuous shooting is allowed. Meanwhile, in the casewhere it is detected that RAW data (all pixels) will no longer beretained (for example, only a free space for one image left), theobstruction detection section 230 supplies the continuous shootingdetermination information indicating that an obstructive factor isoccurring. In the case where it is detected that the free space of thebuffer 151 has been recovered so that RAW data (all pixels) mayadditionally be retained again as a result of progress of the processperformed by the recording image generation section 152, for example,the obstruction detection section 230 supplies the continuous shootingdetermination information indicating that continuous shooting isallowed.

In the case where the in-focus determination result informationindicating that the defocus amount may not be estimated is supplied fromthe in-focus determination section 260, the obstruction detectionsection 230 supplies the continuous shooting determination informationindicating that an obstructive factor is occurring. Meanwhile, in thecase where the in-focus determination result information indicating thein-focus state or the in-focus determination result informationindicating the defocus amount is supplied from the in-focusdetermination section 260, the obstruction detection section 230supplies the continuous shooting determination information indicatingthat continuous shooting is allowed.

The obstruction detection section 230 calculates the remaining number oftimes that the strobe may be used on the basis of the informationsupplied from the strobe operation management section 250. Then, in thecase where it is detected that the strobe will no longer be used (forexample, only one time left), the obstruction detection section 230supplies the continuous shooting determination information indicatingthat an obstructive factor is occurring. Meanwhile, in the case where itis detected that the strobe may be used again as a result of progress ofcharge of the strobe, the obstruction detection section 230 supplies thecontinuous shooting determination information indicating that continuousshooting is allowed.

The obstruction detection section 230 monitors whether or not thecurrent falls short on the basis of the information supplied from thepower source management section 240. Then, in the case where it isdetected that the current falls short, the obstruction detection section230 supplies the continuous shooting determination informationindicating that an obstructive factor is occurring. In this case, inaddition, in the case where it is detected that a surplus current isproduced and the shortage of the current has been resolved as a resultof termination of a recording operation performed by the recordingsection 153 or the like, the obstruction detection section 230 suppliesthe continuous shooting determination information indicating thatcontinuous shooting is allowed.

The operation mode determination section 280 determines whether tocapture an image in the recording image generation mode or to capture animage in the live-view image generation mode to control mode switchingin the case where the operation mode of the imaging apparatus 100 is thecontinuous shooting mode. In the case where the continuous shootingaction signal is supplied from the control section 130 and thecontinuous shooting determination information indicating that continuousshooting is allowed is supplied from the obstruction detection section230, the operation mode determination section 280 supplies the imagesensor 140 with information indicating the recording image generationmode. Meanwhile, in the case where the continuous shooting action signalis supplied from the control section 130 and the continuous shootingdetermination information indicating that an obstructive factor isoccurring is supplied from the obstruction detection section 230, theoperation mode determination section 280 supplies the image sensor 140with information indicating the live-view image generation mode.

In the case where the continuous shooting determination informationindicating that an obstructive factor is occurring is supplied andswitching is performed from information indicating the recording imagegeneration mode to information indicating the live-view image generationmode, the operation mode determination section 280 starts to determinewhether or not to switch information to supply after a predeterminedtime elapses. For example, in the case where the interval of imagecaptures through continuous shooting is 100 msec, the operation modedetermination section 280 starts to determine whether or not to switchto information indicating the recording image generation mode on thebasis of the information from the obstruction detection section 230after a period of 100 msec elapses after switching to the live-viewimage generation mode. The operation mode determination section 280 isan example of a mode control section according to an embodiment of thepresent disclosure.

[Exemplary Cross-Sectional Configuration of Imaging Apparatus]

FIG. 2 is a cross-sectional view schematically showing an exemplarycross-sectional configuration of the imaging apparatus 100 according tothe embodiment of the present disclosure. In the drawing, the imagingapparatus 100 is assumed to be a single-lens camera.

In FIG. 2 which is a cross-sectional view of the imaging apparatus 100,a body 101 and an interchangeable lens 105 are shown. Theinterchangeable lens 105 is a removably mounted lens unit of the imagingapparatus 100, and corresponds to the lens section 110 shown in FIG. 1.The body 101 is a main body of the imaging apparatus 100 that performsan image capture process, and corresponds to components other than thelens section 110 shown in FIG. 1. In the body 101, the shutter button121, the image sensor 140, a display section 161, and an EVF (ElectronicView Finder) 162 are shown.

In FIG. 2, an optical axis (optical axis L12) of the lenses provided inthe lens section 110 and two lines (lines L11 and L13) indicating therange over which the subject light passes are also shown. The rangebetween the lines L11 and L13 indicates the range over which lightpasses to be incident into the image sensor 140.

The display section 161 is a liquid crystal monitor provided on the backsurface of the body 101. The display section 161 displays a displayimage generated on the basis of the RAW data generated by the imagesensor 140. The resolution (number of pixels) of the display section 161is significantly smaller than the resolution of the RAW data (allpixels) generated by the image sensor 140. For example, while the RAWdata (all pixels) have a high resolution of about 4600×3000 pixels(13,800,000 pixels) or the like, the display section 161 has a lowresolution of about 920,000 pixels or the like.

The EVF 162 is an electronic view finder that uses a liquid crystalmonitor, and displays the display image generated by the display imagegeneration section 220 to inform the user of the composition of theimage. In the EVF 162, a display section 163 is shown as a liquidcrystal monitor.

The display section 163 is a display screen in the EVF 162. As with thedisplay section 161, the display section 163 displays a display imagegenerated on the basis of the RAW data generated by the image sensor140. The display section 163 is disposed inside the body 101, and viewedby the user via an eyepiece lens. Therefore, the display section 163 iseasily viewable even in a bright place compared to the display section161. The resolution (number of dots) of the display section 163 isfurther smaller than the resolution of the display section 161.

Thus, the imaging apparatus 100 is provided with an electronic finderand not with an optical finder. The display resolutions of the displaysections provided in the imaging apparatus 100 are significantly lowerthan the resolution of the RAW data (all pixels).

[Exemplary Image Generation Based on RAW Data (all Pixels)]

FIG. 3 is a schematic diagram showing exemplary generation of recordingimage data and display image data based on the RAW data (all pixels)generated by the image sensor 140 set to the recording image generationmode according to the embodiment of the present disclosure.

In FIG. 3, image data 310, 320, 330, 340, 350, and 360 are showntogether with arrows with a description of the content of a process forgenerating the recording image data and the display image data.

The image data 310 schematically show the RAW data (all pixels)generated by the image sensor 140.

The image data 320 schematically show the thinned-out data in whichpixel-by-pixel information (pixel data) contained in the RAW data (allpixels) has been thinned out at predetermined intervals. For example,the image data 320 are generated by thinning out the pixel data atpredetermined intervals in units of rows and columns. In the image data320, numberless broken lines are used to schematically show that thepixel data are thinned out at predetermined intervals.

The image data 330 schematically show the image generated by performinga development process on the thinned-out data (image data 320). Thethinning-out process for generating the image data 320 and thedevelopment process for generating the image data 330 are performed bythe display image generation section 220.

The image data 340 schematically show the image displayed on the displaysection 160.

The image data 350 schematically show the image generated through thedevelopment process performed by the recording image generation section152.

The image data 360 schematically show the image recorded by therecording section 153.

In FIG. 3, the size (number of pixels) in the horizontal direction andthe size (number of pixels) in the vertical direction of the RAW data(all pixels) are indicated by W11 and H11, respectively. Also, the size(number of pixels) in the horizontal direction and the size (number ofpixels) in the vertical direction of the image generated through thedevelopment process (image data 330) are indicated by W21 and H21,respectively.

The process for generating the recording image data and the displayimage data from the RAW data (all pixels) generated by the image sensor140 set to the recording image generation mode will be described withreference to FIG. 3.

First, the process for generating the display image data from the RAWdata (all pixels) is described.

When the image sensor 140 set to the recording image generation modecaptures an image, RAW data (all pixels) (image data 310) are generated.Then, the RAW data (all pixels) (image data 310) are duplicated by thedata duplication section 210 to be supplied to the display imagegeneration section 220 and the buffer 151.

The RAW data (all pixels) (image data 310) supplied to the display imagegeneration section 220 are first subjected to a data thinning-outprocess. This results in generation of thinned-out data (image data 320)in which pixel-by-pixel information (pixel data) has been thinned out.In the data thinning-out process, a thinning-out process is performed inaccordance with the resolution (number of pixels) of the image to bedisplayed on the display section 160. For example, in the case where theRAW data (all pixels) have about 4600×3000 pixels (13,800,000 pixels)and the display section 161 (see FIG. 2) has about 920,000 pixels, thethinning-out process is performed to result in a resolution of about920,000 pixels, which is the resolution of the display section 161.

Then, the display image generation section 220 performs a developmentprocess on the thinned-out data (image data 320) in which the pixel datahave been thinned out to generate display image data (image data 330).The display image data (image data 330) are generated from thethinned-out data (image data 320) which have a small amount of data, andtherefore the process for generating the display image data (image data330) is light and may be performed in a short time. Then, the displaysection 160 displays the display image data (image data 330) to the useras a display screen (image data 340) of an after-view image. The term“after-view image” as used herein refers to a display image that isidentical to the image captured for recording (recording image) and thatis displayed to allow the user to examine the composition of therecording image. That is, in the embodiment of the present disclosure,the after-view image is a display image generated on the basis of theRAW data (RAW data (all pixels)) generated by the image sensor 140 setto the recording image generation mode.

Subsequently, the process for generating the recording image data fromthe RAW data (all pixels) is described.

The RAW data (all pixels) (image data 310) supplied to the buffer 151are sequentially supplied to the recording image generation section 152.Then, the recording image generation section 152 performs a developmentprocess on the RAW data (all pixels) (image data 310) to generaterecording image data (image data 350). Then, the recording image data(image data 350) are subjected to a compression process etc., andthereafter recorded by the recording section 153 as recording image data(image data 360).

By generating the display image data from the thinned-out data in whichinformation has been thinned out in accordance with the resolution ofthe display screen (display section 161) in the imaging apparatus 100 asdescribed above, it is possible to improve the speed of generation of adisplay image.

In the imaging apparatus according to the related art, the recordingimage data which have been subjected to a development process(corresponding to the image data 350) is contracted (subjected to aprocess for reducing the resolution) to be displayed on the displayscreen. Therefore, in the case where continuous shooting is suspendedwith the buffer full, the display screen is not updated (the displayeither remains stationary with a contracted image (after-view image) ofthe last captured recording image or blacks out). According to theembodiment of the present disclosure, on the other hand, the RAW data(all pixels) before being retained in the buffer 151 are supplied to thedisplay image generation section 220. Thus, in the case where the buffer151 is full, a live-view image may be displayed to update the displayscreen.

[Exemplary Mode Switching in Continuous Shooting Action]

FIG. 4 is a timing chart showing exemplary mode switching between therecording image generation mode and the live-view image generation modeperformed in the imaging apparatus 100 according to the embodiment ofthe present disclosure during a continuous shooting action.

In the timing chart, in which the horizontal axis is used as a commontime axis, the operating state of the image sensor 140 (image sensoroperation 410) and the operating state of the shutter of the imagesensor 140 (shutter operation 420) are shown. Also, the continuousshooting determination information (continuous shooting determinationinformation 430) generated by the obstruction detection section 230 anda display image generation operation (display image generation operation440) performed by the display image generation section 220 are shown. Inaddition, the display image (display image 450) on the display section160 and a recording image generation operation (recording imagegeneration operation 460) performed by the recording image generationsection 152 are shown. The timing chart also shows timings 471 to 473 toswitch between the modes. The respective lengths of periods on thehorizontal axis are not to scale.

In FIG. 4, it is assumed that a plurality of recording images aregenerated through continuous shooting by continuously depressing theshutter button. In the timing chart shown in the drawing, a recordingimage capture period (N-1-th) in which an N-1-th recording image isgenerated, a live-view period in which an operation for generating alive-view image is performed, and a recording image capture period(N-th) in which an N-th recording image is generated are shown. It isassumed that the recording image capture period (N-1-th) is startedimmediately after a recording image capture period (N-2-th) isterminated. That is, the N-2-th and N-1-th recording images are capturedwithout interruption (without occurrence of mode switching).

In FIG. 4, it is also assumed that an obstructive factor occurs at apredetermined timing in the recording image capture period (N-1-th). Thecontinuous shooting determination information 430 indicates that thesupply of continuous shooting determination information indicating thatcontinuous shooting is allowed (“L”-level signal) is stopped and thesupply of continuous shooting determination information indicating thatan obstructive factor is occurring (“H”-level signal) is started whenthe obstruction detection section 230 detects the occurrence of theobstructive factor.

First, an operation of the imaging apparatus 100 in the recording imagecapture period (N-1-th) is described.

When the recording image capture period (N-2-th) is terminated (readingof data on the N-2-th image is terminated), the control section 130checks whether or not the shutter button 121 is depressed. Then, becausethe shutter button 121 is kept depressed, the control section 130determines to continue continuous shooting, and continues the supply ofa continuous shooting action signal (timing 471). Also at timing 471,the operation mode determination section 280 checks whether or not anobstructive factor has occurred on the basis of the continuous shootingdetermination information, and determines whether or not to continue therecording image generation mode (timing 471). At timing 471, because thecontinuous shooting determination information is an “L”-level signalindicating that continuous shooting is allowed, the recording imagecapture period (N-1-th) is started at the same time as the recordingimage capture period (N-2-th) is terminated.

In the recording image capture period (N-1-th), image capturepreparation operations such focus adjustment and charge of a motor thatdrives the shutter are performed, and thereafter the shutter is opened(“open”) to expose the image sensor 140 (“exposure (E)”). Then, at thesame time as the shutter is closed (“close”), reading of data from theimage sensor 140 (“read (R)”) is started. In FIG. 4, these operationsare shown in the image sensor operation 410 in the recording imagecapture period (N-1-th) and in the shutter operation 420 in therecording image capture period (N-1-th).

Along with the termination of reading of data on the N-2-th image fromthe image sensor 140, the display image generation section 220 generatesdata on a display image (after-view (AV) image (N-2-th)) (“AV1(N-2-th)”) from the RAW data (all pixels) on the N-2-th image. That is,in the display image generation section 220, thinned-out data aregenerated from the RAW data (all pixels) on the N-2-th image, andthereafter the generated thinned-out data are subjected to a developmentprocess to generate the after-view (AV) image (N-2-th). Then, when thegeneration of the after-view image data is terminated, the displaysections 161 and 163 display the AV image (N-2-th) (“AV1 (N-2-th)”),which is a display image that is identical to the N-2-th recordingimage. In FIG. 4, these operations are shown in the display imagegeneration operation 440 in the recording image capture period (N-1-th)and in display image 450 in the recording image capture period (N-1-th).

Along with the termination of reading of data on the N-2-th image fromthe image sensor 140, the recording image generation section 152generates recording image data (“recording image (N-2-th)”) on the basisof the RAW data (all pixels) on the N-2-th image. In FIG. 4, thisoperation is shown in the recording image generation operation 460 inthe recording image capture period (N-1-th).

Subsequently, an operation of the imaging apparatus 100 in the live-viewperiod is described.

At the timing when reading of data on the N-1-th image from the imagesensor 140 is terminated (timing 472), because the shutter button 121 iskept depressed, the control section 130 determines to continuecontinuous shooting, and continues the supply of a continuous shootingaction signal. Also at timing 472, the operation mode determinationsection 280 checks whether or not an obstructive factor has occurred onthe basis of the continuous shooting determination information, anddetermines whether or not to continue the recording image generationmode. At timing 472, because the continuous shooting determinationinformation is an “H”-level signal indicating that an obstructive factoris occurring, the live-view period is started at the same time as therecording image capture period (N-1-th) is terminated.

In the live-view period, the operation mode of the image sensor 140 isswitched from the recording image generation mode to the live-view imagegeneration mode (“switch”). After the motor that drives the shutter ischarged, the shutter is opened (“open”). Then, exposure and reading arerepeated at a high speed (LV1 to LV6) to sequentially generate RAW data(thinned out) on live-view images. In FIG. 4, the operation mode of theimage sensor 140 is switched (“switch”) after a short time elapses inthe live-view period. This indicates that there is a time lag since theoperation mode determination section 280 detects a transition of thecontinuous shooting determination information until the image sensor 140switches between the modes.

Along with the termination of reading of data on the N-1-th image fromthe image sensor 140, the display image generation section 220 generatesdata on an AV image (N-1-th) (“AV2 (N-1-th)”) on the basis of dataobtained by thinning out the RAW data (all pixels) on the N-1-th image.Then, when the generation of the AV image (N-1-th) data is terminated,the display sections 161 and 163 display the AV image (N-1-th) (“AV2(N-1-th)”), which is a display image that is identical to the N-1-threcording image. The AV image (N-1-th) is displayed until generation ofa first live-view image (LV1) is terminated. When the image sensor 140generates RAW data (thinned out) on the live-view images, the displayimage generation section 220 sequentially generates display image(live-view image) data (“LV1 to LV6”) on the basis of the generated RAWdata (thinned out). Then, when the generation of the live-view imagedata is terminated, the display sections 161 and 163 sequentiallydisplay the live-view images (“LV1 to LV6”).

Along with the termination of reading of data on the N-1-th image fromthe image sensor 140, the recording image generation section 152generates recording image data (“recording image (N-1-th)”) on the basisof the RAW data (all pixels) on the N-1-th image.

Subsequently, an operation of the imaging apparatus 100 in the recordingimage capture period (N-th) is described.

In the live-view period, the operation mode determination section 280checks whether or not the obstructive factor has been resolved on thebasis of the continuous shooting determination information. Then, in thecase where the obstructive factor has been resolved (the continuousshooting determination information has transitioned from the “H” levelto the “L” level), the recording image capture period (N-th) is startedat the same time as the live-view period is terminated (timing 473). Inthe embodiment of the present disclosure, the determination as towhether or not to switch information to supply is started after apredetermined time (the same time as the recording image capture period(N-th)) elapses. This makes it possible to secure a predetermined timeor more for display of the live-view images, to secure a time for theuser to determine the composition, and to mitigate display flicker dueto switching between display operations.

When the recording image capture period (N-th) is started, the shutteris closed (“close”), and the operation mode of the image sensor 140 isswitched from the live-view image generation mode to the recording imagegeneration mode (“switch”). Then, an operation for capturing a recordingimage is performed as in the recording image capture period (N-1-th). InFIG. 4, the operation mode of the image sensor 140 is switched(“switch”) after a short time (time to capture LV7) elapses in therecording image capture period (N-th). This indicates that there is atime lag since the operation mode determination section 280 detects atransition of the continuous shooting determination information untilthe image sensor 140 switches between the modes. Also in the drawing,when the display of the live-view images is terminated, the N-1-thafter-view image (“AV2 (N-1-th)”) is displayed. This allows the user toexamine the N-1-th image which was displayed only for a short time inthe live-view period.

Thus, when reading of data from the image sensor 140 is terminated inimage capture in the recording image generation mode, it is determinedwhether or not to continue the recording image generation mode on thebasis of the continuous shooting determination information. Then, in thecase where the continuous shooting determination information indicatesthat continuous shooting is allowed (“L” level), the recording imagegeneration mode is continued to immediately capture a next image(N-1-th). In the case where the continuous shooting determinationinformation indicates that an obstructive factor is occurring (“H”level), on the other hand, the operation mode is switched to thelive-view image generation mode. When the obstructive factor is resolvedin the live-view image generation mode, the operation mode is switchedto the recording image generation mode to immediately capture a nextimage (N-th).

[Exemplary Operation of Imaging Apparatus]

Next, an operation of the imaging apparatus 100 according to theembodiment of the present disclosure will be described with reference tothe drawings.

FIG. 5 is a flowchart showing exemplary continuous image capture controlprocedures performed in the imaging apparatus 100 according to theembodiment of the present disclosure.

First, the control section 130 determines whether or not the imagecapture mode of the imaging apparatus 100 is set to the continuous imagecapture mode (step S901). Then, in the case where it is determined thatthe image capture mode is not the continuous image capture mode (stepS901), the process returns to step S901 so that the continuous imagecapture control procedures are not performed until the image capturemode is set to the continuous image capture mode.

In the case where it is determined that the image capture mode is thecontinuous image capture mode (step S901), on the other hand, theoperation mode determination section 280 sets the operation mode of theimage sensor 140 to the recording image generation mode (step S902).Subsequently, the control section 130 determines whether or not theshutter button is fully pressed (step S903). Then, in the case where itis determined that the shutter button is not fully pressed (step S903),the process returns to step S903 to wait until the shutter button isfully pressed.

In the case where it is determined that the shutter button is fullypressed (step S903), on the other hand, the image sensor 140 generatesRAW data (all pixels) (step S904). Subsequently, the display imagegeneration section 220 generates thinned-out data, in whichpixel-by-pixel information contained in the RAW data (all pixels) hasbeen thinned out, on the basis of the RAW data (all pixels) (step S905).Thereafter, the display image generation section 220 generates data on adisplay image (after-view image) on the basis of the generatedthinned-out data (step S906). Then, the display section 160 displays thegenerated display image (after-view image) (step S907). Step S906 is anexample of a first display image generation step according to anembodiment of the present disclosure.

Next, recording image data are generated on the basis of the RAW data(all pixels) by the recording image generation section 152, and thenrecorded by the recording section 153 (step S908). Step S908 is anexample of a recording image generation step according to an embodimentof the present disclosure.

Subsequently, the control section 130 determines whether or not the fullpressing of the shutter button has been terminated (step S909). Then, inthe case where it is determined that the full pressing of the shutterbutton has been terminated (step S909), the continuous image capturecontrol procedures are terminated.

In the case where it is determined that the full pressing of the shutterbutton has not been terminated (step S909), on the other hand, it isdetermined whether or not an obstructive factor for continuous shootinghas occurred (step S911). Then, in the case where it is determined thatan obstructive factor for continuous shooting has not occurred (stepS911), the process returns to step S904.

In the case where it is determined that an obstructive factor forcontinuous shooting has occurred (step S911), meanwhile, the operationmode determination section 280 sets the operation mode of the imagesensor 140 to the live-view image generation mode (step S912).Subsequently, image capture is performed in the live-view imagegeneration mode, and the image sensor 140 generates RAW data (thinnedout) through thinned-out reading (step S913). Subsequently, the displayimage generation section 220 generates data on a display image(live-view image) on the basis of the generated RAW data (thinned out)(step S914). Thereafter, the display section 160 displays the generatedlive-view image (step S915). Step S913 and step S904 are an example ofan image capture step according to an embodiment of the presentdisclosure. Step S914 is an example of a second display image generationstep according to an embodiment of the present disclosure.

Subsequently, the operation mode determination section 280 determineswhether or not a predetermined time has elapsed since the operation modeis set to the live-view image generation mode (step S916). Then, in thecase where it is determined that a predetermined time has not elapsed,the process returns to step S913.

In the case where it is determined that a predetermined time has elapsed(step S916), on the other hand, it is determined whether or not theobstructive factor for continuous shooting has been resolved (stepS917). Then, in the case where it is determined that the obstructivefactor for continuous shooting has not been resolved (step S917), theprocess returns to step S913. Step S917 and step S911 are an example ofa detection step according to an embodiment of the present disclosure.

In the case where it is determined that the obstructive factor forcontinuous shooting has been resolved (step S917), meanwhile, theoperation mode determination section 280 sets the operation mode of theimage sensor 140 to the recording image generation mode (step S918), andthe process returns to step S904. Step S918 and step S912 are an exampleof a mode control step according to an embodiment of the presentdisclosure.

According to the embodiment of the present disclosure, as has beendescribed above, it is possible to appropriately provide the user with adisplay image for subject examination when continuously capturing aplurality of recording images by switching between the recording imagegeneration mode and the live-view image generation mode in accordancewith whether or not an obstructive factor is occurring. That is, in thecase where an obstructive factor is occurring, a live-view image isdisplayed on the display screen, which does not result in frozen displayduring continuous shooting. This makes it possible to examine thecomposition of a next recording image to be captured even in the casewhere continuous shooting is obstructed halfway, as with a single-lensreflex camera provided with an optical finder to allow examination ofthe composition even during continuous shooting by moving up and down amirror.

In the imaging apparatus 100, RAW data (all pixels) are duplicated to besupplied to the display image generation section 220 and the recordingimage generation section 152 so that a display image and a recordingimage are generated separately, which allows quick generation of adisplay image. This allows a display image (after-view image) to bedisplayed immediately after the termination of reading of data from theimage sensor 140, which increases the time for examination of theafter-view image. By generating the display image and the recordingimage separately, it is possible to generate a live-view image even ifthe recording image generation process falls behind to make the bufferfull.

In the embodiment of the present disclosure, a single-lens camera thatperforms in-focus determination using a contrast scheme is assumed.However, the present disclosure is not limited thereto, and may besimilarly applied to a camera that performs in-focus determination usinga phase difference detection scheme. In the embodiment of the presentdisclosure, it is assumed to reduce the amount of RAW data throughthinned-out reading and a thinning-out process. However, the presentdisclosure is not limited thereto. As described in relation to FIG. 1,the amount of RAW data may be similarly reduced through added readingand an adding process in which data from adjacently disposed pixels areadded.

In the embodiment of the present disclosure, a full state of the buffer,a state in which the focusing object may not be brought into focus byauto focus (an in-focus position may not be estimated), a non-chargedstate of the strobe, and a shortage of a supplied current are assumed tobe obstructive factors. However, the present disclosure is not limitedthereto, and a variety of other obstructive factors are alsoconceivable. For example, a case where the settings of the imagingapparatus 100 are changed because of changes in aperture and shutterspeed values during a continuous shooting action is conceivable. In thiscase, in addition, in the case where changes in the settings aredetected, the obstruction detection section 230 supplies the continuousshooting determination information indicating that an obstructive factoris occurring.

In the embodiment of the present disclosure, it is assumed that theimage capture mode of the imaging apparatus 100 is set to the continuousshooting mode. However, the present disclosure is not limited thereto.An obstructive factor may occur to obstruct next capture of a recordingimage also in the case where the user depresses the shutter button(image capture command operation) a plurality of times in a short timeto continuously capture a plurality of recording images by repeatingsingle captures a plurality of times. Also in this case, it is possibleto appropriately provide the user with a display image for subjectexamination by applying an embodiment of the present disclosure.

In the embodiment of the present disclosure, a single-lens camera isdescribed. However, an embodiment of the present disclosure is alsoapplicable to other apparatuses that include an imaging element. Forexample, an embodiment of the present disclosure is also applicable to adigital still single-lens reflex camera and a compact digital camerabesides the single-lens camera.

The embodiment of the present disclosure is illustrative of an exemplaryimplementation of the present disclosure. As clarified in the embodimentof the present disclosure, the elements in the embodiment of the presentdisclosure and the elements defining the present disclosure in theappended claims correspond to each other. Likewise, the elementsdefining the present disclosure in the appended claims and the elementsin the embodiment of the present disclosure denoted by the same namescorrespond to each other. The present disclosure is not limited to theembodiment described above, and the embodiment may be modified invarious ways without departing from the scope and spirit of the presentdisclosure.

The process procedures described in the embodiment of the presentdisclosure may be considered as a method including such a series ofprocedures, as a program that causes a computer to execute the series ofprocedures, or as a recording medium that stores the program. As therecording medium, a CD (Compact Disc), an MD (MiniDisc), a DVD (DigitalVersatile Disk), a memory card, a Blu-ray Disc (registered trademark),and so forth may be used, for example.

What is claimed is:
 1. A display control apparatus, comprising: an imagesensor configured to generate image data; a buffer configured to retainsaid image data; a recording medium configured to record said imagedata; a display screen; and a computer configured to: control a displaymode for said display screen; switch, based on an execution of an imagecapture command operation in a continuous shooting mode in which aplurality of continuous still images are captured, said display modebetween an after-view image display mode and a live-view image displaymode, wherein, in said after-view image display mode, an after-viewimage corresponding to said image data on said recording medium isdisplayed on said display screen, and wherein, in said live-view imagedisplay mode, a live-view image is displayed on said display screen;duplicate said image data before said image data is retained in saidbuffer, wherein an obstructive factor that corresponds to a free spaceof said buffer occurs based on said execution of said image capturecommand operation in said continuous shooting mode; and display, on saiddisplay screen, said live-view image based on a shortage of said freespace of said buffer, wherein said live-view image corresponds to saidduplicated image data.
 2. The display control apparatus according toclaim 1, wherein said image sensor is further configured to generate aplurality of image data, wherein said buffer is further configured toretain said plurality of image data, and wherein said computer isfurther configured to switch said display mode between said after-viewimage display mode and said live-view image display mode based on saidobstructive factor.
 3. The display control apparatus according to claim2, wherein a first state of said display control apparatus is indicativeof said shortage of said free space of said buffer to retain furtherimage data, and a second state of said display control apparatus isindicative of a recovery of said free space of said buffer.
 4. Thedisplay control apparatus according to claim 1, wherein said image datais raw data, and wherein said buffer is further configured to retain aplurality of pieces of said raw data.
 5. The display control apparatusaccording to claim 4, wherein said computer is further configured to:generate thinned-out data from said raw data; develop said thinned-outdata; and generate said after-view image based on said developedthinned-out data.
 6. The display control apparatus according to claim 4,wherein said computer is further configured to control supply of saidraw data as said image data, based on said image data recorded on saidrecording medium as said raw data.
 7. The display control apparatusaccording to claim 1, wherein said image sensor is further configuredto: generate raw data from a reduced amount of read data; and generatesaid live-view image based on said raw data.
 8. The display controlapparatus according to claim 1, wherein said computer is furtherconfigured to generate compressed image data as said image data.
 9. Thedisplay control apparatus according to claim 1, wherein said imagesensor is further configured to: generate after-view image data in saidafter-view image display mode; and generate live-view image data in saidlive-view image display mode, wherein a first data amount of saidafter-view image data is higher than a second data amount of saidlive-view image data.
 10. The display control apparatus according toclaim 1, wherein said computer is further configured to wait for athreshold time to switch said live-view image display mode to saidafter-view image display mode after switch of said after-view imagedisplay mode to said live-view image display mode.
 11. The displaycontrol apparatus according to claim 1, wherein said computer is furtherconfigured to: receive a continuous image capture command operation; andswitch said after-view image display mode to said live-view imagedisplay mode based on said continuous image capture command operation.12. The display control apparatus according to claim 1, furthercomprising a strobe configured to emit light to a subject, wherein saidimage sensor is further configured to: receive subject light from saidsubject; and generate said image data based on said subject light. 13.The display control apparatus according to claim 12, wherein saidcomputer is further configured to switch said after-view image displaymode to said live-view image display mode based on a state of charge ofsaid strobe.
 14. The display control apparatus according to claim 1,wherein said computer is further configured to manage a power source ofsaid display control apparatus.
 15. The display control apparatusaccording to claim 14, wherein said computer is further configured toswitch said after-view image display mode to said live-view imagedisplay mode based on a result of said management of said power source.16. The display control apparatus according to claim 1, furthercomprising a body having a shutter button.
 17. The display controlapparatus according to claim 16, further comprising a lens mountable tosaid body, along an optical axis of said image sensor.
 18. The displaycontrol apparatus according to claim 1, wherein said display screencomprises an Electronic View Finder (EVF).
 19. A method, comprising: ina display control apparatus: generating image data by an imagingelement; controlling display mode for a display screen; switching, basedon an execution of an image capture command operation in a continuousshooting mode in which a plurality of continuous still images arecaptured, said display mode between an after-view image display mode anda live-view image display mode; duplicating said image data before saidimage data is retained in a buffer; retaining, in said buffer, saidimage data generated by said imaging element; recording said image dataon a recording medium of said display control apparatus, wherein, insaid after-view image display mode, an after-view image corresponding tosaid image data on said recording medium is displayed on said displayscreen, wherein, in said live-view image display mode, a live-view imageis displayed on said display screen, wherein said buffer is differentfrom said recording medium, and wherein an obstructive factor thatcorresponds to a free space of said buffer occurs based on saidexecution of said image capture command operation in said continuousshooting mode; and displaying, on said display screen, said live-viewimage based on a shortage of said free space of said buffer, whereinsaid live-view image corresponds to said duplicated image data.
 20. Themethod according to claim 19, further comprising: generating a pluralityof image data by said imaging element; retaining, in said buffer, saidplurality of image data; and switching said display mode between saidafter-view image display mode and said live-view image display modebased on said obstructive factor.
 21. The method according to claim 20,wherein a first state of said display control apparatus is indicative ofsaid shortage of said free space of said buffer to retain further imagedata, and a second state of said display control apparatus is indicativeof a recovery of said free space of said buffer.
 22. The methodaccording to claim 19, wherein said image data is raw data, and whereinsaid method further comprising retaining a plurality of pieces of saidraw data.
 23. The method according to claim 22, further comprising:generating thinned-out data by thinning said raw data; developing saidthinned-out data; and generating said after-view image based on saiddeveloped said thinned-out data.
 24. The method according to claim 22,further comprising supplying said raw data as said image data, based onsaid image data recorded on said recording medium as said raw data. 25.The method according to claim 19, further comprising; generating, bysaid imaging element, raw data by reading a reduced amount of read data;and generating said live-view image based on said raw data.
 26. Themethod according to claim 19, further comprising generating compressedimage data as said image data.
 27. The method according to claim 19,wherein a first data amount of after-view image data generated by saidimaging element in said after-view image display mode is higher than asecond data amount of live-view image data generated by said imagingelement in said live-view image display mode.
 28. The method accordingto claim 19, further comprising waiting for a threshold time to switchsaid live-view image display mode to said after-view image display modeafter switching said after-view image display mode to said live-viewimage display mode.
 29. The method according to claim 19, furthercomprising: receiving a continuous image capture command operation; andswitching said after-view image display mode to said live-view imagedisplay mode based on said continuous image capture command operation.30. The method according to claim 19, further comprising: emittinglight, by a light emitting section, to a subject; receiving, by saidimaging element, subject light from said subject; and generating saidimage data based on said subject light.
 31. The method according toclaim 30, further comprising switching said after-view image displaymode to said live-view image display mode based on a state of charge ofsaid light emitting section.
 32. The method according to claim 19,further comprising managing a power source of said display controlapparatus.
 33. The method according to claim 32, further comprisingswitching said after-view image display mode to said live-view imagedisplay mode based on a result of said management of said power source.34. The method according to claim 19, wherein said display screencomprises an Electronic View Finder (EVF).